1. Added copyProperties() to HE_Face, HE_Vertex and HE_Halfedge to
simplify future changes.
2. Added various setColor functions to HE_Mesh
3. fuseCoplanarFaces() now takes face properties of first face in planar
set for new faces.
4. added selection methods with internal label and renamed relevant
functions to blaWithLabel, blaWithOtherabel, blaWithInternalLabel and
bla WithOtherInternalLabel